Processing Machinery
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PVC Sealing Strip
Problem Phenomenon
Door and window PVC sealing strips hardened and shrank after several years
Cause Analysis
Plasticizer volatilization hardened and shrank the sealing strip, causing seal failure; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Select low-volatility plasticizer; replace regularly according to service life; use EPDM as replacement in high-requirement occasions; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
Sealing strip hardening is managed by service-life-based replacement; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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